IBM System x3250 M5 Product Manual page 17

The ServeRAID M1115 SAS/SATA Controller has the following specifications:
Eight internal 6 Gbps SAS/SATA ports

Two x4 mini-SAS internal connectors (SFF-8087)

Supports connections to SAS/SATA drives and SAS Expanders

Supports RAID levels 0, 1, and 10

Supports RAID levels 5 and 50 with optional M1100 Series RAID 5 upgrades

Up to 6 Gbps throughput per port

PCIe 2.0 x8 host interface

Based on the LSI SAS2008 6 Gbps ROC controller

The IBM N2115 SAS/SATA HBA has the following specifications:
Eight internal 6 Gbps SAS/SATA ports

Two x4 mini-SAS internal connectors (SFF-8087)

Supports connections to SAS/SATA HDDs and SATA SSDs

Optimized for SSD performance

No RAID support

Up to 6 Gbps throughput per port

PCIe 3.0 x8 host interface

Based on the LSI SAS2308 6 Gbps controller

For more information, see the list of IBM Redbooks product guides in the RAID adapters category:
http://www.redbooks.ibm.com/portals/systemx?Open&page=pg&cat=raid
IBM System x3250 M5 17